Shears grinder



May 16, 1933.

H. YERKEY SHEARS GRINDER Filed July 5, 1929 2 Sheets-Sheet l /rllllllllIllIl/llllll /E'A/Y YERA/Y INVENTOR. 3

' ATTORNEY May 16, 1933. H, YERKEY 1,909,033

SHEARS GRINDER Filed July 5, 1929 2 Sheets-Shedl 2 /HE/VRY YPAEY INVENTOR.

A TTORNEY complished.

Patented May 1.6, 1933 UNITED STATES HENRY YERKEY, OF GALFSBURG, ILLINOIS' SHEARS GRINDER `Application led July 5,

The present invention pertains to a grind-y er for shears and more particularly to one which automatically feeds the blade across the grinding element as the grinding is ac- It has heretofore been proposed to operate by means ofa motor a grinding wheel against which a shears or scissors blade is held and to manually advance the blade across the grinding wheel. My invention does not pertain to such a construction, but to one in which there is such connection between the grinding wheel and the carriage for the blade to be sharpened that the tworwork together in unison, always producing the desired` results. Among the objects of this invention are to provide a grinding tool of the character indicated in vwhich the functioning of the grinding wheel and of the blade lcarrying o carriage will be coordinated so as to produce u character described the results desired; to provide a machine of the character indicated in which the grinding wheel rwill produce serrations in the edge of the shearblade and the bladecan be run a second time across the grinding wheel without destroying the serrations made the first time the blade traveled across the wheel; to provide in a structure of the character indicated an adjustable stop by means of which the starting position ofthe blade with reference to the grinding wheel may be accurately predetermined; to provide, in a machine of the character indicated, means for holding the shears blade away from the grinding wheel until the point has been reached at which it is desired to-havethe grinding operation commenced; to provide, in a. machine of the general nature indicated, means for holding the shears blade and permitting the same to be automatically engaged with the grinding wheel as soon as the proper point therefor has been reached; to provide mechanism in a machine of the such that a helical '1" groove can be'cut in the grinding face of ya 1929. serial No. 375,997.

desire this disclosure to be understood as Y illustrative only and not in a limiting sense. In the drawings annexed hereto and forming' a part hereof, Fig. l is an elevation with a portion broken away, the same showing my improved shears grinder; Fig. 2 is a plan view of the construction shown in Fig. l; Fig. 3 is a transverse section taken substantially along the plane indicated by the line 3-3, Fig. l; Fig. 4 is a fragmentary vertical section substantially7 along the plane indicated by the line 4-4, Fig. 3, showing a detail of construction of the clutching mech! anism; Fig. 5 is a fragmentary vertical section takenk substantially along the plane of the line 5-`-5, Fig. 1; Fig. 6 is a horizontal section taken substantially along the plane indicated by the line 6 6, Fig. 3; Fig. 7 is a fragmentaryL view of what is now considered the preferred form of my invention; Fig. 8 is a cross-section of this construction substantially along the plane indicated by the line 8 8, Fig. 7; Fig. 9 is a fragmentary detail plan of a portion of the structure shown in Figs. 7 and 8; Fig. 10 is another fragmentary detail of this construction.

Referringnmvmore in detail to the annexed drawings, the frameis denoted by the numeral 1 and isshown as mounted upon a baser 2 Aand secured thereon by suitable means such as bolts 3. The frame is shown as comprising a body and a plurality of legs. Mounted in and extending longitudinally of the frame arcguide rods 4 on which is carried the carriage 5. Between the guide rods 4 is shown a screw 6 which is journaled at its two ends in bushings 7, the latter being held in place in the framework by means of the nuts 8.

Mounted upon the base 2 and within the outlines of the frame 1 is a motor 9 upon the rotary shaft of which is a belt wheel 10. Passing over this belt wheel and cooperating with belt wheel 12 is a belt 11 by means of which rotary motion is transmitted from the motor 9 to the drive shaft which carries the pulley 12. Mounted upon one end of the shaft 13 are pulleys 14 and 15 and upon the opposite end is a grinding wheel 16. This latter is preferably detachably connected to the shaft so that it may be removed and replaced by another grinding wheel having a different character of face or a different tei;- ture. Upright members 17 and 18 form a part of the frame 1 and are perforated to receive and support the shaft 13. This shaft may be mounted directly in these perforations or there may be bushings therein surrounding the shaft and forming bearings therefor. Mounted upon the shaft 6, opposite the pulleys 14 and 15 are pulleys 19 and 20. These pulleys form a speed change mechanism whereby a change can be made in the relative rates of rotation of the shafts 6 and 13, merely by shifting the belt 21 from one pair of pulleys to the other or, if the pulleys are not of such relative sizes that the same belt can be used, then by substituting for the belt in use a different belt of appropriate length. By substituting different pulleys for the pulley 15 and belts of appropriate length, various speed relations bctween the driving and driven shafts may be secured.

As indicated above, a block 5 is perforated and mounted upon the guide rods 4 for sliding motion with relation thereto. This block is also perforated transversely of the direction of the rods 4 and 6 for the reception of the rotary rod 22 provided. with the cranlr arm 23. This rod is notched in one side to form a cam by means of which the blo-cli 24 may be actuated. As shown in Figs 3 and 4 this block is perforated for the reception of the rod 22 and will be actuated downwardly by rotation of said rod. A. spring 25 surrounds the body of the block 24 and the two are received within acavity 26 in the upper part of the bloclr 5.

It will therefore be apparent that rotation of the rod 22 will cause the head 27 of the block 24 to be drawn downwardly and compress the spring 25. It is obvious that when the rod 22 is again rotated to the position shown in Fig. 3 the spring 25 will be* permitted to force the block 24 upwardly again. This block has a semi-cylindrical opening in its upper face in which are cut threads, these latter being capable of engaging the threads of the rod 6. Therefore, when this rod is rotated with the threads of the block 24 in engagement therewith, the block 5 will be caused to move longitudinally of the frame 1.

Extending outwardly from one side of the block 5 is an arm 28 which supports a carrier member comprising a base 29, a pedestal 30 and a clamping head 31. As shown more clearly in Fig. 1, the arm 23 and base 2S) have a slidable interfitting undercut connection so that the base can be adjusted longitudinally of the support. The base is provided with a downwardly extending flange 32 which is perforated for the recep tion of an adjusting screw 33. 'This adjusting screw extends through a perforated and screw threaded portion 34 of the base, thereby making it possible to` secure the desired adjustment between the base and supports and consequently between the holding clamp 31 and the grinding wheel 16.

The pedestal 30 is provided with a head 35 which is outwardly cylindrical. and is received within a cap 36. The coil spring 37 has one end connected to the head of the pedestal so that it cannot rotate relatively thereto. The opposite end of the spring ei;` tends out through a hole 33 in the wall of the cap 36. Therefore, when the holding clamp 31 which is connected with the cap 36 rotated to place a tension upon 'the spring 37, the spring will have a normal tendency to rotate the cup and clamp in the opposite direction. vThe clamp 31 is provided with a substantially cylindrical head 39 which is perforated for the reception of a portion of a clamping device 39a. This is screwthreaded so that rotation of the nut 40 by means of the handle 41 will cause the clamp to be tightened up and hold the clamping means 31 in adjusted position. The clamping means 31 has a body 42 and a movable jaw 43, these two being drawn together by means of an adjustable screw 44. The body 42 is perforated for the reception of a holding member which is hook shaped at one end and, at its other end, has connection with a nut 46. As shown in Fig. 2, this serves to clamp the handle of the shears at one point. Another part of the shears is held between the clamping jaw 43 and the projection 47 at one corner of the holding means 31, as shown in Fig. 2. When the shears has been properly inserted between the projection 47 and the clamping blocl 43 and the clamping screw 44 has been tightened up to hold same in adjusted position, the hoolr 45 is turned down in front of the handle of the shears and then the member 46 is tightened up until the handle is rigidly held. This then holds the shears tightly in properly adjusted position.

A lug 50 formed on the side of the frame 1 is perforated in a direction substantially parallel to the axis of the frame and the perforation is screw threaded for the reception of the screw 51. By adjusting the position 52 and 53 are mounted on the vuprights 17 ted from this structure.

and 18 and are perforatedfor the reception of the screw 54. The perforation's in these brackets serve as bearings for this screw and the latter is held accurately positioned there; by. A gage is perforated and has screw threaded connection with the screw 54. Through one end of this bracket extends an adjusting screw 56, theopposite end 57 serv= ing as a gage to hold the shears blade away from the grinding wheel until such time as it is' desired to have the blade contact the wheel. Resilient means 58 secured to. the gage element bears against the casing 59 which encloses the space between the uprights 17 and 18 and the frame 1. The screw 56, mentioned above, also bears against the casing 59 and serves to adjust the position of the gage and thus the position of the shears blade with reference to the grinding wheel. Therefore, the blade can be held b the age just out of contact with the grin ing w eel until the motor has had time to speed up. The end of the blade will then slide off the part 57 of the gage and will be forced into contact with the grinding wheel by the spring 37 which rotates the head and Vclamping member 31 to cause the blade to be he d in contact with the grindin wheel. w

A switch 60 serves to ma e and breakthe circuit to the motor and theoperati'on thereof may therefore be controlled byV this switch. The shaft 6 hassan 'unthreaded portion 61 adjacent oneend so that the block 5 can not be run against the end of the frame andthus,y possibly, result in the breakage of the machine. Attention should perhaps be called to the fact that the motor shaft and the screw 6 are shielded from the metal and mineral chips resulting from the grinding operation by reason 1of the fact that they are locatedbel'ow the body of the frame and within the 4outline thereof.

In the construction shown in Figs. 7 to 10' there are certain respects in which it differs from the structure shown in the other figures. For example, parts 50 to 58 are omit- Also the parts supported by the base 29 are somewhat modiied. In this constructionthe helical spring 37 is mounted in a hollow in the base 29 and has one end secured to the base andvits other will be to return the shaft to its starting.

place.y A cap 64,'correspondin'g to cap 36, is rigidly secured to shaft 63 by suitable means, such as set screw 65. The cap and shaft therefore rotate together. This cap, like the cap 36, carries the head 39. Carried by this head is the shears holding frame 31a, comprising thev arms 66 and 67 and the U-frame 68 to which'is secured the bracket 69. Threaded in this bracket is an adjusting screw 70 which abuts against thepin 71 connecting the arms 66 and 67. The U- frame 68 is ivotally connected to these arms by the pin 2 and may be turned about this pivot to clamp a shears blade in place. The arms 66 and 67 and the frame 68 are notched as shown at 73 to receive the blade. The post 30, as shown in Fi 10, is provided with an L-shaped slot 75 w ich extends through to the central channel in whi'chis located the shaft 63. This shaft ris provided with a perforation into which extends a pin 76. This permits relative rotation of the bolts 30 and pin or shaft 63 but does not permit the latter to be pulled out of the former. When it is desired to separate these two it is neces-v i 22. This latterl is provided at this point with a flat .portion 81 which permits slight reciprocatory motion f of the plunger 78. Rotating the rod 22 by means of the rcrank 23 either pulls the plunger 78 downwardly or permits it Vto be forced upwardly by the spring 82. `A plug; 83, preferably having screwfthreaded.connection with the base 29 furnishes an abutment against which the lower fend of the sprin` r 82 may rest. As shown in Fig. 10, one sidieof the plunger 78 is provided with a notch into which pin 76 may enter when the plunger 78 is drawn down a proper distance. It will be seen from the foregoing 'that when the crank 23 is turned into a horizontal position, with the flat side 81 down so as to permit the hook 8O to rise, thev plunger 78 will Aremain in the position shown in Fig. 10 until the head l6st is rotated to turn shaft 63 about its axis, thus getting pin 76 out of the notch in the plunger 78. When this happens, the spring 82, which is under compression, forces the plunger 78 upwardly until the hook 8() strikes the flat spot on the shaft This brings a round part of the plunger 78 o po- Site ythe pin 76 and this will hold the sha t 63 in rotated position. Since this carries the no' head'la, that is held in rotated position such that a shears blade held in the notch 73 will be prevented from engaging the grinding wheel. `W'hen the crank; 23 is again turned downwardly the notch in plunger 78 is brought into alignment with the pin 76 and that enters the notch when the shaft 63 turns under the iniiuence oi' the spring 37. This brings the shears blade into Contact with the grinding wheel 16.

Barbers shears, as theyA come 'from the factory, have very little it any serrations on the edges of the blades. Barbers sometimes attempt Ato put such serrations upon one or both blades by the use of a file but this is uncertain and unsatisfactory and has resulted in various attempts to place such serrations in the edges of the blades by means of grinding wheels of various shapes. These constructions have not been scientifically made and have not been as satisfactory as desired and I have therefore developed the construction disclosed herein. If we assume that one ot these machines has just been puchased and set up and that we are ready to place the helical groove on the grinding face of the grinding wheel 16, the procedure will be as follows. The crank 23 will be turned through somewhere from 90 to 180 degrees from the position shown in Fig. 3 which will release the block 27 from the threads of thescrew 6. The block 5 will then be shoved lengthwise until the arm 2S engages the scr w 51. This will be adjusted to such a point that the diamond point in the projection 47 will be closely adj aeentthe grinding wheel but on the side toward the upright 17. j Then this has been adjusted in this position, there will ordinarily be no need 'for again adjusting this screw 51 asfthe arm 28 will always come up against this screw and stop in the proper position, when the machine is being set for operation. The next thing to do is to loosen the nut 10 and adjust the clamping member 31 to such a point that the diamond will point toward the face of the grinding stone or grinding element but positioned so that the metal of the clamping member will not engage the grinding face when the helical groove is being cut. lWhen this is properly adjusted, the nut 410 is again tightened up to hold member 31 in properly adjusted position. The next thing to do is to turnY the screw 33 until the diamond point is so positioned as to engage the grinding face of the grinding element. Ordinarily, no attempt will be made to cut the groove the full depth the first time over as it is possible to bring the carriage back against the screw 51 and make the diamond point travel in the same path on the face of the grinding wheel in going over same a second time.

We will now assume that the grinding wheel has been properly spaced and that we are ready to grind a pair of shears. The shears will now be mounted in the position shown in dotted outline in Fig. 2, the clamp' ing screw 44 being tightened up to hold the shears in place and the hook 15 put over the handle and the nut 1G tightened up to hold the shears in adjusted position. The clamping head supporting means 29, 30 will now be adjusted by means of the screw 33 until the spring 37 is put under suiiicient tension to tightly hold the blade against the grinding wheel. This screw must not be turned too far or the shears blade will swing in a decided are which is undesirable. This blade should travel in a substantially straight line. The block 5 is now moved toward the driving end of the mechanism until the grinding wheel strikes the shears blade at the point where `it is desired to begin the grinding cut. This is normally near the pivot point oi the shears but separated therefrom by a distance of from .L to 1/2 an inch. With the block in this position, the screw 51 is adjusted until it just touches the face 29. lVith the parts thus adjusted, the carriage and shears can be brought back to starting position as many times as desired and the grooves and ridges of the grinding wheel will always strike the same spots on the blade. Shears blades are always ground with a bevel and it will be seen that by loosening the nut 40 the clamping head can be turned about the bolt 239 until the blade is adjusted for the grinding of the desired bevel. Y y

In order to hold the blade away romjthe grinding wheel until the motor has gotten up speed, the shears blade is put against the outer face of the portion 57 of the gage element 55. The position of this longitudinally with relation to the machine may be adjusted by turning the screw 5e, as pointed out above. This adjustment is necessitated by reason of the tact that shear blades are not all of the same length and it is therefore necessary to release some at one lpoint and others at other points. This can be arranged for by the adjustment specified. Normally, only one of a pair of blades will be ground with serrations, the other one being smooth ground. This is provided for by making the grinding wheels readily removable. A smooth faced wheel can then be substituted for it. The other blade will then take the place of the one which has been ground with serrations and this will be ground on the smooth stone.

In this specilication and the appended claims, the word stone has been used to designate the grinding wheel, irrespective oi' the material of which it is composed. It

`is of course immaterial whether this is made from natural stone or is an artificial grinding Wheel.

Having noW described my invention, I claim:

l. Shears suporting means for use in connection With a shears grinder, said supporting means including a block movable length- Wise of the machine, said block having a supporting arm projecting laterally from the machine, a supporting base carrying a pedestal andbeing adjustable along the arm, a cup mounted on the upper end of the pedestal and rotatable with relation thereto in a substantially horizontal direction, a spring to hold the cup tensioned in one direction, a clamp pivoted on the cup to swing in a substantially vertical plane., and means for rigidly holding a pair of shears in adjusted position in the clamp.

2. In a structure for the purpose indicated, a frame, a rinding Wheel rotatably carried by the rame, suporting means mounted in the frame, a block supported on and moving along the supporting means, means for continuously advancing the block along the supporting means, said block being constructed to hold a shears blade and carry the same across the grinding Wheel, a gauge mounted on the frame in a position to be engaged by the blade and hold the same out of contact Withthe grinding wheel, said gauge being adjustably positionable nearer to or farther from the ywheel so as to coperate With blades of different lengths.

3. A structure as defined by claim 2 provided With resilient means serving to swing the blade into contact with the grinding Wheel and hold it there.

4. A structure as defined by claim 2-hav ing means adjustablyrcarried kbythe frame for adjustably limiting the traverse of the block in one direction.

In Witness whereof, I hereunto subscribe my naine to this specification.

HENRY YERKEY. 

